This elevator is basically just a plank of wood, string (NOT thread), a weight and a pulley.
To start out with, you tie a square or overhead knot in the center of the plank of wood.
Next, thread the string through the pulley.
Next use a weight equal to the wood plank to keep to from falling out.
Tie a knot around a dumbbell or kettlebell weight equal to the weight of the plank.
last attach the pulley to an area you want to elevate yourself to.
if necessary, use a 9v or lithium ion battery and a motor for the pulley to move, otherwise use your hands and weighted string side.
make sure you test it and HAVE FUN, it is important.
enjoy your new simple elevator :)
P.S. this Instructible was made in memory.
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Step 1: More Things You Can Do
you can also build a box and nail it to the plank of wood to build a simple dumbwaiter. Cut out a fraction in the wall of your house (if you are permitted [if type of house is apartment or rent to own house]) insert pulley on a stud in the wall